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| author |   Thierry Reding <treding@nvidia.com> | 2019-12-18 14:42:01 +0100 |
|---|---|---|
| committer |   Joerg Roedel <jroedel@suse.de> | 2019-12-23 14:07:03 +0100 |
| commit | f9f6971ebb75f5bc302d77e3380dd6363cc1a0f6 (patch) | |
| tree | 919c446498b05bbe855dc1fee1882fe0cb8751cf | |
| parent | iommu/iova: Silence warnings under memory pressure (diff) | |
| download | wireguard-linux-f9f6971ebb75f5bc302d77e3380dd6363cc1a0f6.tar.xz wireguard-linux-f9f6971ebb75f5bc302d77e3380dd6363cc1a0f6.zip | |
iommu: Implement generic_iommu_put_resv_regions()
Implement a generic function for removing reserved regions. This can be
used by drivers that don't do anything fancy with these regions other
than allocating memory for them.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
| -rw-r--r-- | drivers/iommu/iommu.c | 19 | ||||
| -rw-r--r-- | include/linux/iommu.h | 2 |
2 files changed, 21 insertions, 0 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index fdd40756dbc1..101f2d68eb6e 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2229,6 +2229,25 @@ void iommu_put_resv_regions(struct device *dev, struct list_head *list) ops->put_resv_regions(dev, list); } +/** + * generic_iommu_put_resv_regions - Reserved region driver helper + * @dev: device for which to free reserved regions + * @list: reserved region list for device + * + * IOMMU drivers can use this to implement their .put_resv_regions() callback + * for simple reservations. Memory allocated for each reserved region will be + * freed. If an IOMMU driver allocates additional resources per region, it is + * going to have to implement a custom callback. + */ +void generic_iommu_put_resv_regions(struct device *dev, struct list_head *list) +{ + struct iommu_resv_region *entry, *next; + + list_for_each_entry_safe(entry, next, list, list) + kfree(entry); +} +EXPORT_SYMBOL(generic_iommu_put_resv_regions); + struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot, enum iommu_resv_type type) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index f2223cbb5fd5..e80b83b8cab8 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -456,6 +456,8 @@ extern void iommu_set_fault_handler(struct iommu_domain *domain, extern void iommu_get_resv_regions(struct device *dev, struct list_head *list); extern void iommu_put_resv_regions(struct device *dev, struct list_head *list); +extern void generic_iommu_put_resv_regions(struct device *dev, + struct list_head *list); extern int iommu_request_dm_for_dev(struct device *dev); extern int iommu_request_dma_domain_for_dev(struct device *dev); extern void iommu_set_default_passthrough(bool cmd_line); |